This intentional reference has been addressed by writer Kieron Gillen.

It is uncertain whether the word is used in its older sense (meaning "happy") or is an intentional, joking reference to homosexuality.

The episode contains many intentional references to the 1939 musical film The Wizard of Oz.

At the time, fans believed that this was an intentional reference to Sam Jones and therefore placed the books and the audios in the same continuity.

However, the name is also an intentional reference to the actor Lucy Lawless who plays the character Xena.

"Breathe" is set on 16 June, an intentional reference to James Joyce's novel Ulysses.

The title is an intentional reference to an advertising campaign previously run by clothing retailer Gap, one of the companies Munroe sent invoices to.

References in contemporary Western art or literature are, more likely than not, intentional references to the Beast symbolism.

This seems to be an intentional reference to a painting described in Crispin's first novel, Yesterday's Son.